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CAT 3 Help

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chirag.shah285
 Post subject: CAT 3 Help
 Post Posted: Mon Mar 09, 2009 6:57 pm 
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Course Students


Posts: 1
If a^2 is not equal to b^2, what is the value of a – b/a^2 – b^2 ?

(1) 3^b + 2 = 81

(2) a = 3^2b – 3

Can someone explain how to work this out? Thanks
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esledge
 Post subject: Re: CAT 3 Help
 Post Posted: Mon Mar 16, 2009 4:29 pm 
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ManhattanGMAT Staff


Posts: 901
Location: St. Louis, MO
Hi Chirag,

Can you please clarify a bit, perhaps by putting in parentheses? I think the statements must both be 3 to the power of all that follows the ^ sign, but just want to be certain.

Also for future posts, please make the Subject the first 5-8 words of the question itself, for easy searching by others. See our forum guidelines for more info.

In the meantime, here's a hint: a^2 - b^2 = (a - b)(a + b). Plug that back into the original question and rephrase as much as you can (manipulate/simplify and find the "kernel").

Another hint: Recognizing 81 as a certain power of 3 is important for (1).

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Emily Sledge
Instructor
ManhattanGMAT
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yousuf_azim
 Post subject: Re: CAT 3 Help
 Post Posted: Sat Aug 27, 2011 8:55 am 
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Students


Posts: 45
Dears,

What is ANS?

BR
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jnelson0612
 Post subject: Re: CAT 3 Help
 Post Posted: Sat Oct 01, 2011 3:44 pm 
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ManhattanGMAT Staff


Posts: 1857
mmrs151 wrote:
Dears,

What is ANS?

BR


It looks like C to me.

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Jamie Nelson
ManhattanGMAT Instructor
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